<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes" />
    <title>ShellCheck: SC2293 – When eval'ing @Q-quoted words, use * rather than @ as the index.</title>
    <link rel="stylesheet" href="css/bootstrap.min.css" />
  </head>
  <body style="margin-left: auto; margin-right: auto; max-width: 800px">
    <h1>SC2293 – ShellCheck Wiki</h1>
    <a href="https://github.com/koalaman/shellcheck/wiki/SC2293">See this page on GitHub</a>
    <p style="display: none"><a href="index.html">Sitemap</a></p>
    <hr />
    <h2 id="when-evaling-q-quoted-words-use--rather-than--as-the-index">When
eval'ing @Q-quoted words, use * rather than @ as the index.</h2>
<h3 id="problematic-code">Problematic code:</h3>
<div class="sourceCode" id="cb1"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb1-1"><a href="SC2293.html#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="bu">eval</span> <span class="st">&quot;</span><span class="va">$MYCOMMAND</span><span class="st"> </span><span class="va">${@</span><span class="op">@</span><span class="va">Q}</span><span class="st">&quot;</span></span></code></pre></div>
<h3 id="correct-code">Correct code:</h3>
<div class="sourceCode" id="cb2"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb2-1"><a href="SC2293.html#cb2-1" aria-hidden="true" tabindex="-1"></a><span class="bu">eval</span> <span class="st">&quot;</span><span class="va">$MYCOMMAND</span><span class="st"> </span><span class="va">${*</span><span class="op">@</span><span class="va">Q}</span><span class="st">&quot;</span></span></code></pre></div>
<h3 id="rationale">Rationale:</h3>
<p>ShellCheck noticed that you are calling <code>eval</code> and
including an escaped array. However, the array is passed as multiple
arguments and relies on being implicitly joined together to form a
single shell string, which <code>eval</code> can then evaluate.</p>
<p>Instead, prefer building your shell string with explicit string
concatenation by using <code>*</code> instead of <code>@</code> for the
index, such as <code>${*@Q}</code> or <code>${array[*]@Q}</code>.</p>
<p>This suggestion is equivalent to <a href="SC2124.html">SC2124</a>, but for
<code>eval</code> arguments rather than string variables.</p>
<h3 id="exceptions">Exceptions:</h3>
<p>None.</p>
<h3 id="related-resources">Related resources:</h3>
<ul>
<li>Help by adding links to BashFAQ, StackOverflow, man pages, POSIX,
etc!</li>
</ul>
    <hr />
    <p style='font-size: 80%'><a href="../index.html">ShellCheck</a> is a static analysis tool for shell scripts. This page is part of its documentation.</p>
  </body>
</html>


